Long-term prognosis of preserved hearing function after surgery in patients with cerebellopontine angle tumors other than vestibular schwannoma

Useful hearing function after surgery was preserved at a high rate during a long-term postoperative period in patients with typical CPA tumors other than VSs. Compared with patients with VSs, in whom hearing loss owing to inner ear dysfunction is not rare in the long-term after surgery, patients with CPA tumors demonstrated a apparently lower incidence of inner ear dysfunction and a more favorable long-term hearing prognosis. In patients with CPA tumors, not only hearing improvement by the surgery but also its long-term preservation can be expected. In this study, we confirmed that the phenomenon of postoperative hearing deterioration occurs only in patients with VSs among all CPA tumors.